Скачать или смотреть How to Use Direct Path Insert with Force Logging Enabled in Oracle Databases

Explore the implications of using `Direct Path Inserts` in Oracle when `Force Logging` is enabled. Learn effective strategies for handling data loads in your databases while ensuring data integrity and performance.
---
This video is based on the question https://stackoverflow.com/q/77843792/ asked by the user 'Sherzodbek' ( https://stackoverflow.com/u/8686756/ ) and on the answer https://stackoverflow.com/a/77846319/ provided by the user 'Paul W' ( https://stackoverflow.com/u/20542862/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to use Direct path insert on db if force logging is enabled on database level?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding Direct Path Inserts and Force Logging in Oracle Databases

In the world of data warehousing and database management, performance is crucial, especially during the Extract, Transform, Load (ETL) processes. One common technique used to boost load operations is the Direct Path Insert, but many database administrators (DBAs) find themselves confused when Force Logging is enabled on the database level. The question arises:

Is there any point in using direct path inserts if force logging is turned on? If force logging negates the benefits of direct inserts, what alternatives do I have?

Exploring the Problem: Direct Path Inserts vs. Force Logging

To appreciate the intricacies of this question, let’s establish what Direct Path Inserts and Force Logging are.

What is Direct Path Insert?

Direct Path Insert allows bulk data loading directly into a target table by:

Bypassing the buffer cache,

Writing directly to disk, and

Allocating new extents instead of searching for free blocks.

What is Force Logging?

Force Logging is a database setting that ensures that all changes to data are recorded in the redo logs. This aids in:

Data recoverability,

Ensuring consistency and integrity of data, even in the event of a failure.

The challenge arises when these two settings intersect. Often, DBAs worry that force logging may negate the advantages offered by direct path inserts, especially regarding performance.

Navigating the Complexity of Force Logging and Direct Path Inserts

The Implications of Force Logging

When force logging is enabled:

All data manipulations must be recorded in the redo logs, even those that would otherwise be marked as NOLOGGING.

While this provides additional safety against data loss, it can increase the workload on the database from a performance perspective.

Advantages of Direct Path Inserts Despite Force Logging

However, there’s good news. When it comes to using direct path inserts with force logging:

Direct Path Inserts Remain Efficient: The operation still benefits from direct writes to disk, minimizing the load on background processes and optimizing performance.

Efficient Space Allocation: New extents are allocated for the data, thus reducing contention and improving insertion speed.

Instant Rollback: In the event of an error, the rollback is immediate (by simply dropping new extents) rather than lengthy as in conventional inserts.

Key Benefits of Continuing to Use Direct Path Inserts

Here’s a concise list of reasons to stick with direct path inserts, even with force logging enabled:

Improved Performance: Direct manipulation of the data on disk adds efficiency.

Reduced Buffer Cache Load: By bypassing caching, the overall system load is lessened.

Rollback Simplification: Quick rollback procedures allow for more streamlined operations.

Conclusion: Embrace Both Techniques

In summary, using Direct Path Inserts in an environment where Force Logging is enabled does not cancel out the benefits associated with it. Rather, both techniques can be leveraged to maximize efficiency while preserving data integrity. Direct path inserts remain a valuable tool, and DBAs can confidently use these operations to enhance data loading processes.

Whether you are performing a full table load or partitioning data across multiple jobs, understanding how these concepts interact will equip you to optimize your database operations effectively.

By continuing to employ direct path inserts within the framework of force logging, you are ensuring both enhanced performance and data safety in your environment.